jari jari 2 buah lingkaran 12 cm dan 15 cm hitunglah perbandingan :
a. keliling
b. luas daerahnya
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K ling1 = 2 phi r
= 2 . phi . 12
= 24phi cm
K ling2 = 2 phi r
= 2 . phi . 15
= 30 phi
a. jadi perbandingan keliling
K ling1 : K ling2
24phi : 30phi
4 : 5
Luas = phi. rkuadrat
L ling1 = phi . 12kuadrat
= 144phi
L ling2 = phi . 15kuadrat
= 225phi
b. jadi perbandingan luas
L ling 1 : L ling2
144phi : 225phi
16phi : 25phi